Ключевые слова: 40 50 years, american, back, business, cargo, caucasian, commercial, connection, coupling, dolly, equipment, fifth, fleet, frame, freight, grease, greasing, hand, hitch, hook, leading trailer, lock, lubricant, lubricate, maintenance, male, mature, mechanic, middle age, oil, part, repair, semi, semitrailer, service, shipping, tractor, tractor unit, trailer, transport, transportation, truck, trucker, trucking, vehicle, wheel, wheels, worker,